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Immunohistochemical localization of glandular kallikrein in the endocrine and exocrine human pancreas

GS Pinkus, M Maier, DC Seldin, O ole-MoiYoi, KF Austen and J Spragg

Fab fragments from two new monospecific anti-human tissue kallikrein sera were examined for their capacity to inhibit the functional activities of purified human urinary kallikrein and purified human pancreatic kallikrein. Fragments from a new anti-urinary kallikrein serum and from an anti-pancreatic kallikrein serum yielded mixed inhibition of kinin-generating activity and minimal inhibition of esterolytic activity. In contrast to the previously described "active site directed" anti-urinary kallikrein, these new antisera demonstrated little specificity for epitopes near the enzymatic site of urinary or pancreatic kallikrein. When used to localize kallikrein antigen in human pancreas obtained at surgery, IgG fractions of the new anti- kallikrein sera yielded moderate acinar and ductal staining in the absence of pretreatment of the tissue with trypsin or pronase. Short incubation with 0.125 mg/ml of either enzyme permitted the discrete localization of islet beta cell kallikrein antigen, while increased pronase concentrations decreased kallikrein antigen in both islets and exocrine tissue and led to islet destruction. Both antibody specificity and tissue preparation influence kallikrein localization in human pancreas.

Volume 31, Issue 11, pp. 1279-1288, 11/01/1983
Copyright © 1983 by The Histochemical Society


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